The PIDKEY property contains the part of the Product ID entered by the user. The ValidateProductID action validates the Product ID entered by comparing the PIDKEY property to the PIDTemplate property.
The PIDKEY property can be set on the command line or through the user interface. This property contains only the part of the Product ID that is entered by the user.
||Windows Installer 5.0 on Windows Server 2012, Windows 8, Windows Server 2008 R2 or Windows 7. Windows Installer 4.0 or Windows Installer 4.5 on Windows Server 2008 or Windows Vista. Windows Installer on Windows Server 2003 or Windows XP. See the Windows Installer Run-Time Requirements for information about the minimum Windows service pack that is required by a Windows Installer version.